package usw.webserver.util;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class PropsUtil {

	private static final Logger LOGGER = LoggerFactory.getLogger(PropsUtil.class);
	
	/**
	 * 
	 * @param fileName
	 * @return
	 */
	public static Properties loadProps(String fileName)
	{
		Properties 	props = null;
		
		InputStream	is = null;
		
		try {
			is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
			
			if 	(is == null) {
				throw 	new FileNotFoundException(fileName + " file is not found");
			}
			
			props = new Properties();
			props.load(is);
		}
		catch(IOException ex) {
			LOGGER.error("load properties file failure", ex);
		}
		finally
		{
			if	(is != null)
			{
				try 
				{
					is.close();
				} catch(IOException ex) {
					LOGGER.error("close input stream  failure", ex);
				}
			}
		}	
		
		return	props;
	}
	
	/**
	 * 
	 * @param props
	 * @param key
	 * @return
	 */
	public static String getString(Properties props, String key) {
		
		return	getString(props, key, "");
	}
	
	/**
	 * 
	 * @param props
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	public static String getString(Properties props, String key, String defaultValue)
	{
		String	value = defaultValue;
		
		if	(props.containsKey(key)) {
			value = props.getProperty(key);
		}
		
		return	value;
	}
	
	/**
	 * 
	 * @param props
	 * @param key
	 * @return
	 */
	public static int getInt(Properties props, String key) {
		
		return	getInt(props, key, 0);
	}
	
	/**
	 * 
	 * @param props
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	public static int getInt(Properties props, String key, int defaultValue)
	{
		int	value = defaultValue;
		
		if	(props.containsKey(key))
		{
			value = CastUtil.castInt(props.getProperty(key));
		}
		
		return	value;
	}
	
	/**
	 * 
	 * @param props
	 * @param key
	 * @return
	 */
	public static boolean getBoolean(Properties props, String key)
	{
		return	getBoolean(props, key, false);
	}
	
	/**
	 * 
	 * @param props
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	public static boolean getBoolean(Properties props, String key, Boolean defaultValue)
	{
		boolean	value = defaultValue;
		
		if	(props.containsKey(key))
		{
			value = CastUtil.castBoolean(props.getProperty(key));
		}
		
		return	value;		
	}
}
